Abstract
Environmental heterogeneity in natural ecosystems influences several parameters at the population and community levels. In freshwater ecosystems, habitat heterogeneity can be provided by macrophyte species with different structural shapes. Previous studies suggest that aquatic plants with more complex architectures will support higher number, biomass, and taxon richness of macroinvertebrates than plants with simpler shape. We investigated the influence of macrophyte structural heterogeneity (quantified by fractal dimension) and food availability (represented by epiphytic biomass) on several parameters (number of individuals, biomass, body size distribution, taxon richness, and diversity) of the macroinvertebrate community in a Pampean stream. Four submerged macrophyte species (Egeria densa, Elodea ernstae, Ceratophyllum demersum, and Stuckenia striata) and associated macroinvertebrates were sampled in late spring, summer, and autumn. Plants were photographed and fractal dimension was estimated from the images by the box-counting method. Fractal dimension was independent of plant surface area per unit of macrophyte biomass and differed significantly among species. Mean fractal dimension varied between 1.29 and 1.62, and increased following the sequence E. densa → S. striata → E. ernstae → C. demersum. Macrophyte species with higher fractal dimension supported a greater abundance of macroinvertebrates, especially those of small body size (500–1,000 μm); but fractal dimension was unrelated to macroinvertebrate biomass, richness, and diversity. However, overall animal biomass was significantly associated to the epiphytic abundance. Consequently, macrophyte heterogeneity influences macroinvertebrate density and body size distribution, while animal biomass depends on epiphytic food resources provided by plants.
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Acknowledgments
The authors are grateful to Fernando Momo for valuable discussion in the early steps of the study and Rafael Marcé for their useful comments on the manuscript. We also thank Santiago Doyle for his contribution to the development of the fractal dimension estimation technique, Matias Eöry for providing previous field data, the landowner and the manager of Santa María del Arroyo farm for providing access to the study site, María Andrea Casset, Analía Álvarez, and Patricia Aoki for field and laboratory assistance, and Mary Eve Coviella for the revision of the English text. The manuscript was improved by the suggestions and comments of the editor and two reviewers. This project was supported by the Universidad Nacional de Luján.
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Ferreiro, N., Feijoó, C., Giorgi, A. et al. Effects of macrophyte heterogeneity and food availability on structural parameters of the macroinvertebrate community in a Pampean stream. Hydrobiologia 664, 199–211 (2011). https://doi.org/10.1007/s10750-010-0599-7
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DOI: https://doi.org/10.1007/s10750-010-0599-7